<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="box">
        <div class="flextest">
            <div>
                <div class="no1">我是标签1</div>
                <div class="no2">我是标签12</div>
                <div class="no3">我是标签13</div>
                <div class="no4">我是标签41</div>

            </div>
            <div>
                <div class="no5">我是标签15</div>

            </div>
        </div>
    </div>
</body>
<style>
    *{
        margin: 0px;
        padding: 0px;
    }
    .box{
        display: flex;
        justify-content: center;
        align-items: center;
        width: 100%;
        height: 800px;
    }
    .flextest{
        display: flex;
         flex-wrap: nowrap;
        width: 80%;
        height: 100%;
        justify-content: space-between;
    }
    .flextest :nth-child(5){
        /* align-self: flex-end;
         */
         background-color: aqua;
    }
</style>
</html>